Transforming Auxetic Metamaterials into Superhydrophobic Surfaces

Glen McHale, Andrew Alderson, Steven Armstrong, Shruti Mandani, Mahya Meyari, Gary Wells, Emma Carter, Rodrigo Ledesma Aguilar*, Ciro Semprebon, Kenneth Evans

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

Superhydrophobic materials are often inspired by nature, whereas metamaterials are engineered to have properties not usually occurring naturally. In both, the key to their unique properties is structure. Here, it is shown that a negative Poisson's ratio (auxetic) mechanical metamaterial can transform into a unique superhydrophobic material. When stretched, its surface has the counterintuitive property that it also expands in the orthogonal lateral direction. The change in the solid surface fraction as strain is applied is modeled, and it is shown that it decreases as the space between solid elements of the auxetic lattice expands. This results in a unique dependence of the superhydrophobicity on strain. Experimental models are constructed to illustrate the relationship between different states of strain and superhydrophobicity as the lattice transitions from an auxetic to a conventional structure. The findings offer a new approach to designing superhydrophobic materials for self-cleaning surfaces, droplet transportation, droplet encapsulation, and oil–water separation.

Original languageEnglish
Article number2300458
Number of pages30
JournalSmall Structures
Issue number4
Early online date17 Jan 2024
Publication statusPublished - 8 Apr 2024

Keywords / Materials (for Non-textual outputs)

  • auxetic metamaterials
  • engineered surfaces
  • superhydrophobicity


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